Hippolyte lepla



(No Model.)

H. LE'PLAY.

PROCESS OF AND APPARATU$ POE BARYTA 0R STRONTIA TREATMENT OF SAGGHAEINELIQUORS AND PRODUOTION AND RECOVERY OF THESE REA GENTS.

No. 810,448. Patented Jain. 6, 1885,.

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llrvrrnn STATES PATENT @rrrcn.

HIPPOLYTE LEPLAY, OF PARIS, FRANCE.

PROCESS OF AND APPARATUS FOR BARYTA OR STRONTIA TREATMENT OF SACCHARINELIQUORS AND PRODUCTION AND RECOVERY OF THESE REAGENT S.

SPECIFICATION forming part of Letters Patent No. 310,448, dated January6, 1885.

Application filed April 23, 1884. (No model.) Patented inFranceSeptember 25, 1883, No. 157,739. and November 27, 1883, No.

153,818; in England September 20, 18: 3, No. 4,592; 111 Belgium December12, IFSS, No. 63 517, and in Italy December 21,

To all whom it may concern:

Be it known that I, I-IIPIOLYTE LEPLAY, a citizen of France, residing atParis, in the Republic of France, chemist, have invented a 5 new anduseful Process of and Apparatus for Baryta or Strontia Treatment ofSaccharinc Liquors, and for Production and Recovery of these Reagents,(for which I have obtained patents in France, dated September 25, 1883,

I No.157,732, and dated November 27,1883, No. 158,818; Great Britain,dated September 26, 1883, No. 4,592; Belgium, dated December 12, 1883,and Italy, dated December 21, 1883,) of which the following is aspecification.

I In treating saccharine liquors-sueh as beet. juice or molasses withhydrates of the alka line earthsbaryta and strontia-there isconsiderable diliiculty and loss in dealing with the large quantity ofliquid resulting from the treatment, and there is great expense inproviding fresh supplies of these reagents.

My invention has for its object to overcome these obj eetions byproducing and employing the reagents in the condition of low hydrates,

or, as they may be termed, monohydrates, and by recovering them, afterthey have effected treatment of saccharine liquor, in a conditionsuitable for subsequent use.

I will first describe the process and appara- 0 tus, according to myinvention, for applying the inouohydrate of baryta or stronti'a tosaccharine liquor, referring to the accompanying drawing, which is avertical section of a vessel suitable for the purpose.

A is a strong closed vessel,like a boiler,hav-

ing bolted on it a cover, F, with man-hole F, safety-valve Q,pressure-gage H, and thermometer I. A steam-pipe, J, communicates withthe lower and upper parts of the vessel 40 by stop-cocks or valves J J JThe lower and upper parts communicate by a pipe pro vided withstop-cocks or valves L L. The vessel is also provided with other cocksor valves, G, for escape of air; M, for admitting the liquor; N, fordecanting liquid from the precipitate; O, for admitting boiling waterunder pressure; K, for emptyin Near the bottom is fixed afinely-perforated screen, B,

and about midway in the vessel a grating, O, is supported on anangle-iron, E, this grating having a rod, D, by \vhichit can be liftedout when the cover is removed. P is a manhole, for discharge ofsucrat'e. The inonohydrate is introduced through the man-hole F infragmeutawhich rest on the grating G, and O the saccharine juice boilingis then admitted by M in suflicient quantity to fill the lower part ofthe vessel and cover the grating'O, so that the monohydra-te becomesdissolved by it. The man-hole F being now closed, steam is admitted byJ, to blow through theliquid, escape being open at G. h en all theinonohydrate is dissolved, G is closed, and the pressure is raised toseveral atmospheres. J is then closed, and in a few minutes theprecipitate of su- 6- crate of baryta or strontia subsides on the screenB. The cocks L L are then opened, so as to equalize the pressure aboveand below the deposit of sucrate, and K is gradually opened, allowingthe mothcnliquor to escape. Then boiling water or a boiling weaksolution of the alkaline earth injected by O is broken up by the screenQand falls in a shower upon the sucrate, through which it passes,washing it. During the washing the cock Kis almost closed, so as tomaintain considerable pressure within the vessel. When the sucrate issufficiently washed, the cock L is closed, and steam blown through fromabove effects drainage of the precipitate. The hole P is then opened,and the precipitate is raked out and transferred to a vessel to betreated with carbonic acid. It is of advantage to use mono- I hydratesomewhat in excess, as the excess may in great part be recovered incondition of hy- 8 drate by concentration of the mother-liquor. \V henbaryta is employed, pressure is not nec essary, and therefore the vesselmay be open. Strontia,however,is generally to be preferred, as it isinnocuous. When the liquor to be 0 treated is in a thick condition, suchas that of molasses, it should be diluted suifieiently with water tomake it freely dissolve the monohydrate.

The sucratc of baryta or strontia obtained 5 as above described istreated in the usual like a drairrpipe.

way with carbonic acid, so as to precipitate carbonate of baryta orstrontia from the sirup, which is separated from the carbonate bydecanting and filter-pressin In order to produce the monohydrate fromthe carbonate, or to recover the monohydrate for subsequent use, thecarbonate is molded into forms presenting extended surface. A veryadvantageous form is that of a shorttube, These molded pieces are heatedin a furnace, and while hot are subj ected to the action of superheatedsteam, which has the effect of driving off the carbonic acid, andcausing the material to assume the condition of monohydrate, or lowhydrate, which fuses and can be run off the furnace by a tapping-hole.This process, when applied to carbonate of baryta, presents littledifficulty, but when applied to the carbonate of strontia it requiresvery careful adjustment of the temperature. I therefore prefer to dealwith the carbonate of strontia in the following manner: I heat themolded pieces and subject them to the action of superheated steam. Ifthe temperature somewhat exceeds that which produces monohydrate infusion, the result is that the carbonate is converted into anhydrate,which is in the form of hard pieces. I break these pieces into fragmentsand mix them with crystals of ordinary hy drate of strontia, which maybe that recovered from the mother-liquor and wash-liquor in thesaccharine treatment above described. By the mixture of the anhydratewith the hydrate a vigorous action is set up accompanied by heat thatcauses considerable evaporation of water, and the result of the actionis a monohydrate, or low hydrate, suitable for the treatment of freshdoses of saccharine liquor.

Having thus described the nature of my invention and the best means Iknow of carrying the same into practical effect, I clai1n l. Thewithin-process of obtaining sucrate of baryta or strontia, consisting inadding monohydrate or low hydrate ot' baryta or strontia to saccharineliquor, and dissolving the same therein to form the precipitate of thebaryta or strontia, substantially as described.

2.- The within process of treating saccharine liquor to obtain sucrateof baryta or strontia, consisting in bringing boiling saccharine liquorand monohydrate or low hydrate of baryta or strontia together, thenblowing steam through the liquid, and subsequent ly, when thenionohydrate. has dissolved, allowing the mother-liquor to escape,thenwash ing the precipitate thus formed, and afterward blowing steamthrough it to drain the same, substantially as described.

The within process of producing and recovering monohydrate orlow hydrateof baryta or strontia, consisting in heating the carbonate of baryta orstrontia, and while in that condition subjecting the carbonate to theaction of superheated steam to drive off the carbonic acid,substantially as described.

4. The process herein described of producing the monohydrate or a lowhydrate of strontia, said process consisting in mixing the ordinaryhydrate with fragments of anhydrate produced by the action ofsuperheated steam upon the heated carbonate of strontia,substantially asdescribed.

5. The processherein described of producin g the monohydrate 01' a lowhydrate of strontia for use in the treatment of saccharine liquors, saidprocess consisting in molding the carbonate of strontia. into formspresenting extended surfaces, heatingthe molded pieces, subjecting themtothe action of superheated steam, breaking said pieces into fragments,and mingling them with crystals of ordinary strontia hydrate,substantially as described.

6. The apparatus herein described and shown for the treatment ofsaccharine liquors by a low hydrate of baryta or strontia, saidapparatus consisting of the closed vessel A, having a cover providedwith a man-hole, the stean1- pipe J, communicating with the upper andlower parts of the vessel, escape-valve G, in letvalve M,decanting-valve N, hot-water valve 0, and outlet K, said vessel havingan inner finely-perforated screen, 13, near its bottom, with a man-hole,P, above and a grating, C, midway of said vessel, substantially asdescribed.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this 29th day of March, A.

HIPPOLYTE LEPLAY.

Witnesses:

Ronr. M. I-loornn, ARMENGAUD, J eu ne.

